Automation System
A disadvantage of Numerical Control (NC) is:

the machine tool can easily overheat
the tape and tape reader are not reliable
one operator is needed for each machine.
the computer is not reliable
None of these

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Automation System
An encoder:

can have only four keys
converts an input to a binary number
is used to send telegraph signals
converts a binary number to a decimal number.
None of these

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Automation System
D/A (digital to analog) conversion:

has to be sampled at 1/2 the highest input frequency
must be fed through a filter to reproduce the original signal accurately
both (b) and (c)
results in a binary code as the final output
None of these

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